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Derivative Instruments (Hedged Item Offset By Derivatives Achieving Fair Value Hedge Accounting) (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Fixed maturities, available-for-sale	[1]	$ 378,596	$ 412,905
Commercial mortgage and other loans	[1]	64,554	65,425
Policyholders’ account balances		(160,227)	(161,682)
Future policy benefits		(290,536)	(306,343)
Carrying Amount of the Hedged Assets (Liabilities)
Derivative [Line Items]
Fixed maturities, available-for-sale		367	402
Commercial mortgage and other loans		20	20
Policyholders’ account balances		(1,434)	(1,627)
Future policy benefits		(1,415)	(1,585)
Cumulative Adjustment Included in Carrying Amount
Derivative [Line Items]
Fixed maturities, available-for-sale		60	79
Commercial mortgage and other loans		1	2
Policyholders’ account balances		(96)	(303)
Future policy benefits		$ (202)	$ (372)
[1] See Note 4 for details of balances associated with variable interest entities.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies.

+ References

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount of liability due to policyholder for deposit held under long-duration contract issued by insurance entity.

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